Grinding-mill



- J. CARL.

- GRINDING MILL. No. 25,176. Patented Aug. 23, 1859.

UNITE STATES PA E T QFFIG J. CARL, OF GRENADA, MISSISSIPPI.

GRINDING-MILL.

Specification of Letters Patent No. 25,176, dated August 23, 1859.

To all whom it may concern:

Be it known that I, J. CARL, of Grenada, in the county of Yalabusha and State of Mississippi, have invented a new and Improved Grinding-Mill; and I do hereby declare thatthe following is a full, clear, and exact description-of the same, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 represents a vertical transverse section of a grinding mill constructed according to my invention. Fig. 2 is a horizontal section of the upper stone.

Similar letters of reference in both views indicate corresponding parts.

To enable those skilled in the art to make and use my invention I will proceed to describeits construction and operation.

A represents a. frame constructed of wood sufficiently strong and of convenient size and shape for the operation'and this frame forms the bearings for a vertical shaft B, which is stepped into the bottom cross-bar, a, as clearly represented in Fig. 1. Attached to this shaft by means of a hinged lever, a, is the upper stone, C, said lever being secured to the shaft by means of a pivot, b, and the stone is provided with a recess, 0, which extends up to or nearly to its center and which is large enough for the ends of the lever, which is secured to the stone by means of screw bolts, d, and the stone is so arranged that it is perfectly balanced on the pivot, I), which secures the lever, a, to the shaft. The lower stone, D, is attached to a tube or sleeve E, which fits nicely over the shaft, B, of the upper stone and which rests on the bridge tree F, one end of which is pivoted to the lower end of the standard, e, and its other end is suspended from a rod, f, which passes to the outer end of the top bar, 9, and which is provided with a screw thread and nut, It, so that by means of this screw the end of the bridge tree F, can be raised or lowered. One end of the top bar, g, is hinged to the upper end of the standard, 6, and its other end (that one through which the rod, f, passes) rests on a corresponding standard 6, the lower end of which forms a guide for the bridge tree F. The shaft, B, passes freely through the bridge tree and its upper end is guided in a cavity in the top bar, 9, and a collar or ring, g, is slipped over this shaft so as to prevent the dust and flour from getting between the same and The stones, C and D, therefore, are rotated in difierent directions.

The object of securing the upper stone to the shaft B, by means of the hinged lever, a, is three-fold: in the first place the upper bearings of the shaft is thereby brought in such a position that it can easily be oiled, and that the dust and the flour from the stone can not get to it so easily: Secondly, by attaching the stone to the lever which is pivoted to the shaft, its grinding surface can always adapt itself to the surface of the lower stone; and thirdly, when the lower stone is raised by the action of the rod, f, and nut, h, a direct pressure is exerted on the substance between the grinding surfaces of the two stones independent from the weight of the upper stone, which is secured to the shaft, B, in such a manner that it cannot assume a longitudinal motion in the direction of said shaft. understood how this mill can be adjusted under all circumstances to suit the work, so that it can be made to grind coarse or fine as may be desired and the grinding surfaces can be brought nearer to or farther from each other without stopping the mill by simply turning the nut, h, in one direction or in the other, and the bearings of the shaft can easily be kept clean and well oiled as the same can be reached equally well when the mill is running as when it stands still, and if it should be necessary to give a thorough cleaning to the upper bearing, this can easily be effected by raising the top bar, 9.

I do not claim broadly the employment of 10' screws extending through the stone into arms within the eye for the purpose of adjusting the upper stone; nor do I claim the making of the lower stone adjustable in a vertical direction, but 10.

Having thus described my invention I is at- 60 From these reasons it will easily be 85 claim as new and desire to secure by Letters (g) in combination with shaft and stones C, D, as and for the purpose herein shown 7 Patent 1. The arrangement and combination of and described. the pivoted lever (a) shaft B, stone 0, and J. CARL. 5 screws d, substantially as and for the pur Witnesses:

pose herein shown and described. W. B. MAY, 2. The employment of a hinged top bar T. H. CUNNINGHAM. 

